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No. 6I4,092. Patented Nov. I5, I898. G. T. 'EAMES.

. DRILL GRINDER.

A nmion filed Oct. 4, 1897.)

2 Sheets-Sheet I.

(No Model.)-

Attbrney.

Patented N'ov. I5, I898.

No. s|4,092.

G. T. EAMES.

DRILL GRINDER. (Appliction filed Oct. 4, 1897.)

2 Sheets-Sheet 2.

National.)

I nv e n to r.

Atto rney- UNITED STATES PATENT Grace.

GARDNER '1, EAMES, F KALAMA'Zoo, MICHIGAN, ASSIGNOR OF ONE-HALF To FRANK D. FULLER, OF SAME PLACE.

DRILL-GRINDER.

SPECIFICATION formiiig part of Letters Patent No. 614,092, dated November 15, 1898.

Application filed October 4,1897. Serial No. 654,072. (No model.)

ing both twist drills and flat drills.

The objects of this invention are, first, to provide in drill-grinding machines an improved means of adjusting the axis of oscillation of the drill-holder to the grindingwheels to secure a proper curvature of the surface of the drill-point for different sizes of drills; second, to provide improved means of adjusting'the drill-holder to secure proper clearance in grinding drills, this being desirable when the difference in quality of different materials to be drilled is taken into consideration; third, to simplify the construction of this class of drill-grinding machines generally, and, fourth,to provide. an improved adjustable drill-holder which can be utilized for holding any kind of drill, either flat or twist.

Further objects will definitely appear in the detailed description to follow.

I accomplish these objects of my invention by the devices and means described in the following specification, definitely pointed out in the claims, and illustrated in the accompanying drawings, in which- Figure 1 is an elevation view of my improved drill-grinding machine. Fig. 2 isa detail plan view of the drill-holder mechanism removed from the machine, showing the adjusting means for varying the clearance in the drill to be ground. Fig. 3 is an inverted detail plan view of the structure shown in Fig. 2, showingthe same parts. Fig. i is an enlarged detail elevation of the drill holder and bracket taken from the opposite side of the view shown in Fig. l. r Fig. 5 is a detail plan view of the journal F and plate F with the engaging lever J. Fig. 6 is an enlarged detail top plan view of the adjustable sleeve L with the sleeve .L attached for supporting the journal and bracket of the drill-holder. Fig. 7 is an enlarged detail sectional elevation of the part shown in Fig. 6, taken on a line corresponding to line 7 7 of Figs. a'and 6. Fig. 8 is an enlarged detail front elevation of the drill-holder detached. Fig. 9 is a sectional view taken on a line corresponding to line 9 9 of Fig. 2, showing the means of adjusting the clearance device and of adjusting the drill-grinder to different sizes of drills. Fig. 10 is an enlarged detail sectional viewtaken on line 10 10 of Fig. 2,-showing the same parts as Fig. 9. Fig.

- 11 is an enlarged detail sectional view on line 11 11 of Fig. 2, showing the construction of the adjustable tailpiece for the drill-holder. Fig. 12 is an enlarged detail sectional view taken on line 12 12 of Fig. 1, showing the means of adjusting the tail-stock and also the manner of fixing the tailpiece in posi tion.

In the drawings similar letters of reference refer to similar parts throughout the several views, and all of the sectional views are taken looking in the direction of the littlearrows at the ends of the section-lines.

Referring to the lettered parts of the drawings, A represents the main frame of the machine, which may be a suitable floor, stand, or bracket, or bracket for use on a suitable stand or bench and carries the remaining parts-of the machine.

A is the driving-pulley of the machine, and A is the emery or grinding wheel.

Extending out from the main frameA and suitably supported or secured thereto is a round bar' K, which serves to support the drill-holder mechanism. On this bar K is a sleeve or bracket L, which has an upwardlyprojecting sleeve L secured thereto, which receives the journal on which the drill-holder swings in use. The sleeve L, withits contained journal, is inclined toward the grinding-wheel at an oblique angle. Thesleeve L is adjusted on the shaft K by means of the sliding sleeve S, supported on bolt t, transverse thereto and adapted to press against the shaft K by means of a screw-threaded hand-wheel M on said bolt. The shaft K partially intersects the journal F", on which the drill-holder swings, and the journal F is turned down into a neck to fit the shaft, so

that it is retained in place by merely sliding the sleeve L onto the shaft K.

Stops a are on the sleeve L and are located to engage a stop a, projecting out from spindle F, which limits the swing of the drillholder when a drill is being ground. On the top of the journal F is a plate F, which extends obliquely upward and contains a longitudinal grooved guideway. Secured to this plate and journal F is a lever J, pivoted at 12, containing an engaging slot 0", the use of which will be explained hereinafter. The lever is held in position by a spring 72 under the short end of the same.

The main body of the drill-holder is provided with a slideway B, on which is supported the V-shaped rests for the drill. One of these, B, at the front end is made integral with or rigidly secured to the slideway B. This portion is cut off at an oblique angle and has an adjustable lip P (see Fig. 8) projecting partially across the same to serve as a support for the point or lip of the drill while it is being ground. This adjustable lip is made straight on its supporting edge and eX- tends from the angle of the V-shaped groove upwardly. The adjustment is accomplished by a screw in a slot or by a series of holes, so that the lip can be easily set for different styles of drills. One style is shown in Fig. 8, where the rest is adapted for use on a twistdrill of any size through the same being properly located by the angle of the lip. When flat drills are to be ground, the lip is moved up after loosening the set-screw until it stands nearly vertical or quite so, when any size of flat drill can be properly ground.

To one side of and toward the upper end of the main portion of the drill-holder and its slideway B is a plate E, extending in the same plane, and on this plate is supported a suitable downwardly-projecting slide G, which is adjustable to and fro by its being supported on the pivot II. The adjustment is accomplished, preferably, by the transverse thumb-screw 1. Other devices might be employed. A suitable pointer 50 indicates the position on a suitable scale. (See Fig. 2.) The object of this adjustment is to vary the clearance of the drill.

It will be observed that the slide G stands at an oblique angle to the direction of the slide 15 of the drill-holder. This slide G rests in the slideway of the plate F, and owing to the angle at which the slide is set it will be observed that when the drill-holder is moved back and forth the distance of the journal F from the central line of the drill-holder and the slideway B will be varied in the exact proportion to the distance to which it is moved.

The bolt 11', wit-h the lever H thereon for tightening the same, extends down through the plate E through a slot in the plate F and into a suitable nut below, which is prevented from turning by being engaged in a slideway on the under side by the plate F. This serves to clamp the parts together after they have been brought to the position required.

The central drill-support B is secured to the slideway by the downwardly-projecting bolt 0'. (Clearly appearingin Fig. 9.) A rubber washer is interposed with other washers on the bolt between its nut and the under side of the slideway. This retains its central support in place at any point on the slideway to which it may be moved and yet permits of the same being moved by a little pressure without the necessity of tightening and loosening the nut or the bolt. The lower end of the bolt 0" is a round pin, and this is adapted to engage in the notch r in the lever J. The central rest B and the rest B, which is rigid with the slideway, are separated from each other as though they were cut at an oblique angle from each other. The two proximate surfaces serve as the limbs of the calipers for the drill and adjusting the machine to drills of different size.

The use of the lever J, with its slot 7" is to engage the pin at the bottom of the bolt 0' and hold these parts in a fixed relation to each other, so that when a drill is placed between the parts B and B it will move the entire drill-holder forward, which of course has the effect of adjusting the same in the plate F and sets the drill-holder in proper relation to the journal F thereof, and thus secures the proper location of the drill-holder for any size drill by merely inserting it between the parts B and B when the hook r engages the bolt 0'.

When the machine is set to the particular size drill required in the grinder, it is brought to work by loosening the hand-wheel M and tightening the same, when the holder is moved to the right point toward the grinding-wheel.

The drill is ground by merely pressing it into the groove and swinging the holder back and forth, so the drill contacts with the em cry-wheel.

The drill is supported longitudinally by the adjustable tailpiece D, which is supported in the tail-stock O, which is adjustable along the slideway B by the hand-wheel O. The tailpiece is adjusted by the thumb-nut D", retained in a suitable guideway in the sleeve 0, moving the head-piece D back and forth short distances for the finer adjustment and to feed the drill to be ground.

In grinding it will be noted that the surface formed on the point of the drill by this method is always a small portion of the surface of a cone. The size and position of the cone is determined by the position of the parts of the drill grinder and holder.

The drill in the holder does not lie in a radial plane of the cone, but slightly to one side of the same, so that the center of the cone does not come inside the drill.

The clearance device adjusted by the screw I has the effect of moving the drill nearer to or farther from the center of the cone of which the ground surface of the drill is a portion to secure different angles therefor in order to vary the angle at the point of the drill which secures the clearance, as it is called, in the cut of the drill. It will be observed that as this adjustment effects the slide G, which is at an oblique angle, it is not necessary to vary the clearance for different size drills, because when it is once set it gives them all the same angle. I desire to state in this connection that the structure of my improved drill-holder can be considerably varied in its details without departing from my invention. The manner and style of the various adjusting screws is not material. Different tailpieces and tail-blocks might be employed on the slideway and the drill-holder would be very satisfactory without the slide G being made adjustable, though this adjustment is of very great advantage.

No doubt other modifications and variations will occur to and be readily'applied by those skilled in the art to which my invention pertains.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a drill-grinding machine the co rnbination of the main frame A, carrying a grinding-wheel-with means of actuating the same; a cylindrical supportingbar K, extending from said frame transverse to the grindingwheel; an adjustable sleeve L, on said bar K; an obliquely-projecting sleeve L, with a bearing therein secured to sleeve L; a plate F, having a slideway therein and having a journal F, projecting obliquely therefrom and supported on the bearing in sleeve L; a drill-holder having a slideway B a grooved drill rest B, rigidly secured at the forward end of the slideway having its rear end in an oblique plane to the slideway; a movable central rest B, on said slideway B, the forward end of which is oblique to correspond to the rear of rest B; and a tail-block O, with adjustable tailpiece therein on said slideway; an adjustable slide G, set at an oblique angle to the slideway B, and resting in the slideway on plate F; suitable means of clamping the two together; means for temporarily engaging the central slide with plate F, so that the insertion of a drill between the rests B, and B, will move the main body of the drillholder forward and set the same to properly grind the particular drill for the purpose specified.

2. In a drill-grinding'machine the combination of the main frame; a grinding-wheel with means of actuating the same; a cylindrical bar-support; an adjustable sleeve thereon; a

tion of the main frame; a grinding-wheel and means of actuating the same; a cylindrical bar-support; a sleeve'therefor; a transverse screw-threaded bolt on said sleeve; a collar S, on said bolt adapted to contact with the bar; a hand-wheel M, with screw-thread on said bolt to clamp said collar against the bar; for the purpose specified.

4. In adrill-grinding machine the combina tion of a main frame with revoluble grindingwheel thereon; a suitable journal F, in a bearing L, at an oblique angle to the face of the grinding-wheel and adjustable to and from the same; a plate F, rigid with said journal containing a suitable slideway; a drillholder consisting of an elongated slideway; a drill-rest at the front thereof and rigid there with having an oblique face at the rear; a movable central rest with an oblique face in front corresponding to the rear face of the front rest; a suitable tail-block with adjustable tailpiece; a slide supported on said holder at an oblique angle to the slideway and adapt ed to the slideway on the plate F; means of adjusting said slide; and means of connecting the central rest of the holder to the plate F, so that when a drill is placed between the proximate faces of the front and middle rests the drill-holder will be adjusted in its relation to the journal so thatwhen it is brought to the grinding position the front will receive a proper surface as specified.

5. In a drill-grinding machine the combination of a main frame with a grinding-wheel thereon; a carrying-journal supported at an' oblique angle to the face of the grindingwheel; a plate on said journal with a slideway therein; a drill-holder with suitable rests for drills; a slide on the under side of said hold er resting in the slideway on said journal; means of adjusting said slide to control the relation of the holder to the axis of the jour= nal to vary the clearance, as specified.

6. Ina drill-grinding machine the combination of a main frame with a grinding-wheel thereon; a carrying-journal supported at an oblique angle to the face of the grindingwheel; a plate on said journal with a slide way thereon; a drill-holder with suitable rests for drills; a slide on the under side of .said holder resting in the slideway on said journal; a set-screw transverse to said slide and engaging the same to adjust it to control the relation of the holder to the axis of the journal to Vary the clearance as specified.

'7. In a drill-grinding machine the combina-- tion of a main frame with a revoluble grinding-wheel thereon; a drill-holder consisting of a main slideway supported on an oblique journal; there being a sliding connection between the two oblique to the slideway of the holder; a fixed rest at the front of the holderslideway; a movable central rest; a pin on said movable rest; a lever on the journal part with a notch to engage said pin, so that the insertion of a drill between the rests secures ing transversely across the same at one end having a straight edge extending up from the bottom of the V and means of adjusting the same at any required angle to support different styles of drills.

In witness whereof I have hereunto set my hand and seal in the presence of two Witnesses.

GARDNER T. EAMES. [n s.]

Vitnesses:

VENE E. OHAPPELL, OTIS A. EARL. 

